JP4070045B2 - Fluid pipe removal prevention device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for preventing extraction of fluid pipes joined by inserting an insertion portion of the other fluid pipe into one fluid pipe, and in particular, a lock ring provided at the insertion portion of the fluid pipe; The present invention relates to a fluid pipe withdrawal prevention device that prevents fluid pipes from being pulled out by an engagement member that engages with a lock ring.
[0002]
[Prior art]
As this type of device, for example, a fluid pipe withdrawal prevention device proposed in Japanese Utility Model Laid-Open No. 5-52478 is known.
[0003]
FIG. 8 shows a conventional extraction preventing device.
An annular groove A2 is formed on the outer peripheral surface of the insertion portion A1 of the fluid pipe A. The annular groove A2 has a tapered male screw portion B1 having a downward slope toward the end of the insertion portion A1 on the outer peripheral surface. The formed lower ring B is divided into two parts. Further, an upper ring C in which a female screw portion C1 that is screwed into the male screw portion B1 of the lower ring B is formed on the inner peripheral surface is externally fitted to the lower ring B and screwed.
[0004]
The upper ring C is screwed into the lower ring B and tightened, and the lower ring B is fastened to the annular groove A2 by the action of the tapered male screw portion B1 and the female screw portion C1, and the upper ring C and the lower ring are connected to the fluid pipe. B is fixed.
[0005]
When an extraction force is applied to the fluid pipe, the upper and lower rings fixed to the fluid pipe engage with an engaging member provided in the other fluid pipe receiving portion (not shown) to pull out the fluid pipes. Is prevented.
[0006]
[Problems to be solved by the invention]
In this conventional apparatus, since the outer peripheral surface of the lower ring B and the inner peripheral surface of the upper ring C are formed in the tapered male screw portion B1 and the female screw portion C1, respectively, high machining accuracy is required in the manufacturing process. At the same time, it took time and effort to process, leading to a rise in processing costs. Also in the assembly process of the upper and lower rings, it takes time to screw the upper ring into the divided lower ring, and the assembling cost is high, and the manufacturing cost of the lock ring provided in the insertion portion is high.
[0007]
The problem to be solved by the present invention is to solve the above-mentioned problems, and is to provide a fluid pipe withdrawal prevention device that simplifies the processing and assembly of the lock ring and reduces the manufacturing cost.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problem, the extraction preventing device according to the present invention includes a lock ring provided in a convex shape on the outer peripheral surface of the insertion portion of the fluid pipe inserted through the locking member. In a fluid pipe withdrawal preventing device that prevents fluid pipe withdrawal by engaging with a member,
The lock ring is composed of a split ring body having at least one split portion that fits in an annular groove formed on the outer peripheral surface of the insertion portion, and a covering ring body covering the outer peripheral surface of the split ring body,
The outer peripheral surface of the split ring body is formed with an outer tapered surface that expands toward the insertion end, and the inner peripheral surface of the covering ring body is in close contact with the outer tapered surface of the split ring body. A tapered surface is formed,
A plurality of engagement rods are formed integrally on the end side of the insertion portion of the covering ring body, and a locking piece directed in the inner diameter direction is formed at the tip of the engagement rod. , has become a engagement surface rear side in the insertion direction of the cover ring body is brought into contact with the locking member,
When the covering ring body is pulled toward the insertion port side of the fluid pipe, the engagement rod is bent along the outer taper surface, and the locking piece gets over the divided ring body and engages.
[0011]
According to the present invention, the split ring body and the cover are formed by engaging the split ring body and the covering ring body with the engagement rod in the annular groove formed on the outer peripheral surface of the fluid pipe insertion portion. Since the ring body does not require a threaded portion, processing and assembly are not time-consuming and manufacturing costs can be reduced.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0013]
1 to 3 show a first embodiment of the present invention, which is applied to a ball-type flexible tube.
[0014]
A lock ring 1b is formed at the distal end side of the insertion portion 1a of a ductile iron spigot pipe (fluid pipe) 1 so as to protrude from the outer peripheral surface.
[0015]
The lock ring 1b is divided into two divided ring bodies 2 arranged in an annular groove 1c formed on the outer peripheral surface on the distal end side of the insertion portion 1a, and a covered ring body that is externally fitted so as to cover the outer peripheral surface. It consists of three.
[0016]
The outer peripheral surface of the split ring body 2 is formed with a tapered outer taper surface 2a that expands toward the end of the insertion portion, and the inner peripheral surface of the covering ring body 3 closely contacts the outer taper surface 2a. An inner tapered surface 3a in contact therewith is formed. The split ring body 2 and the covering ring body 3 are formed by casting or forging and do not need to be machined.
[0017]
Four engagement rods 3b are integrally formed on the end side of the insertion port 1a of the covering ring body 3, and an engagement surface 3c that contacts the locking member 5 is formed on the opposite side. . The minimum inner diameter of the covering ring body 3 is formed larger than the outer diameter of the spigot tube.
[0018]
The spigot tube 1 is inserted into a spherical ball body 4 having an outer peripheral surface formed with a locking member 5 and a packing housing groove 4a on the inner circumferential surface via a packing 7 disposed in the packing housing groove 4a so as to be watertight and extendable. ing.
[0019]
The ball body 4 is rotatably fitted in a cover body 6 provided with a flange portion 6a on one side and a receiving portion 6b for receiving the ball body 4 on the other side. A packing housing groove 6c and a groove 6d are formed on the inner surface of the receiving portion 6b, and a ball presser 8 is fitted in the groove 6d. A packing 9 is disposed in the packing receiving groove 6c, and the ball body 4 and the cover body 6 are joined in a watertight manner.
[0020]
Next, a procedure for attaching the split ring body 2 and the covering ring body 3 to the spigot pipe 1 will be described.
[0021]
First, the spigot tube 1 in which the annular groove 1b is formed on the outer peripheral surface of the insertion portion 1a is inserted into the ball body 4 in which the packing 7 is disposed in the packing housing groove 4a.
[0022]
Next, the covering ring body 3 is externally fitted to the insertion portion 1 a of the spigot tube 1 in a direction in which the locking surface 3 c and the locking member 5 face each other, and is arranged between the annular groove 1 b and the locking member 5.
[0023]
Next, the split ring body 2 is arranged in the annular groove 1b, and the covered ring body 3 that has been externally fitted is pulled toward the distal end of the insertion portion, and the inner tapered surface 3a is brought into close contact with the outer tapered surface 2a of the split ring body 2. Thus, the stopper function is made to work, and the split ring body 2 is pressed and fitted into the annular groove 1b.
[0024]
The engagement rod 3b is projected from the end of the split ring body, bent in the tube center direction, and the covering ring body 3 is engaged with the split ring body 2.
[0025]
When a force acts in the direction in which the spigot tube 1 is pulled out from the ball body 4, the engagement surface 3c and the locking member 5 are engaged, and the split ring body 2 is moved by the action of the inner tapered surface 3a and the outer tapered surface 2a. The split ring body 2 and the annular groove 1c are further pressed against the annular groove 1b and the spigot tube 1 and the ball body 4 are prevented from being pulled out.
[0026]
4 and 5 show a second embodiment of the split ring body 2 and the covering ring body 3. An annular groove 1b is formed on the distal end side of the insertion portion 1a of the spigot tube 1, and a divided ring body 2 divided into two is disposed.
[0027]
The covering ring body 3 is externally fitted so as to cover the outer peripheral surface of the split ring body 2. The outer circumferential surface of the split ring body 2 is formed with an outer tapered surface 2a having a taper shape whose diameter increases toward the end of the insertion portion, and the inner circumferential surface of the covering ring body 3 is in close contact with the outer tapered surface 2a. An inner tapered surface 3a in contact therewith is formed.
[0028]
On the end side of the insertion portion of the covering ring body 3, four engagement rods 3b protrude and are integrally formed, and are engaged at the distal end of the divided ring body 2 facing the inner diameter direction in the distal end direction. A locking piece 3d is formed. On the opposite side, an engagement surface 3c that contacts the locking member is formed.
[0029]
The procedure for attaching the split ring body 2 and the covering ring body 3 to the spigot tube 1 is substantially the same as that of the first embodiment, and when the covering ring body 3 is engaged with the split ring body 2, the engagement rod 3b is attached. The difference is that there is no need to bend.
[0030]
When the covering ring body 3 that has been externally fitted to the insertion portion 1a is drawn to the split ring body 2 that is installed in the annular groove 1b and externally fitted, the locking piece 3d of the engagement rod 3b contacts the outer tapered surface 2a. Further, when the covering ring body 3 is further drawn, the engaging rod 3b is bent along the outer tapered surface 2a, and when the locking piece 3d gets over the dividing ring body 2, the dividing ring body 2 and the covering ring body 3 are engaged. The
[0031]
6 and 7 show a third embodiment of the split ring body 2 and the covering ring body 3.
[0032]
An annular groove 1b is formed on the distal end side of the insertion portion 1a of the spigot tube 1, and a divided ring body 2 divided into two is disposed. And the covering ring body 3 is externally fitted so that the outer peripheral surface of the division | segmentation ring body 2 may be covered.
[0033]
The outer peripheral surface of the split ring body 2 is formed with an outer tapered surface 2a having a taper shape that expands toward the end of the insertion portion 1a, and a concave groove (engagement concave portion) 2b is continuous in the circumferential direction on the distal end side. Is formed.
[0034]
The inner peripheral surface of the covering ring body 3 is formed with an inner taper surface 3a that is in close contact with the outer taper surface 2a. 3b protrudes and is integrally formed, and a locking piece 3d that engages with the concave groove 2b of the split ring body 2 facing the inner diameter direction is formed at the tip thereof. On the opposite side, an engagement surface 3c that contacts the locking member is formed.
[0035]
The procedure for attaching the split ring body 2 and the covering ring body 3 to the spigot tube 1 is substantially the same as that of the first embodiment, and when the covering ring body 3 is engaged with the split ring body 2, the engagement rod 3b is attached. The difference is that there is no need to bend.
[0036]
When the covering ring body 3 that has been externally fitted to the insertion portion 1a is drawn to the split ring body 2 that is installed in the annular groove 1b and externally fitted, the locking piece 3d of the engagement rod 3b contacts the outer tapered surface 2a. When the covering ring body 3 is further brought into contact, the engagement rod 3b bends along the outer taper surface 2a, moves on the outer taper surface 2a, moves, and the locking piece 3d falls into the concave groove 2b of the split ring body 2. The split ring body 2 and the covering ring body 3 are engaged.
[0037]
The present invention is not limited to the above embodiments, and can take various forms.
[0038]
In the embodiment, the outer peripheral surface of the split ring body 2 and the inner peripheral surface of the covering ring body 3 are formed as tapered surfaces, but they may be parallel.
[0039]
In the embodiment, the divided ring body 2 is divided into two parts, but may be divided into three or more parts.
[0040]
The split ring body 2 may be provided with a groove portion that engages with the engagement rod and engages the split ring body 2 and the covering ring body 3 so as not to be relatively rotatable.
[0041]
【The invention's effect】
According to the present invention, since the lock ring is provided on the outer peripheral surface of the insertion portion of the fluid pipe, the split ring body and the covering ring body are engaged with the annular groove formed in the insertion portion by the engagement rod. The processing cost can be kept low because there is no need for processing of parts that require high processing accuracy such as, and in assembly , the split ring can be obtained by pulling the coated ring body toward the inlet of the fluid pipe. Since only the engagement piece of the covering ring body is engaged with the body, it does not take time and manufacturing costs including processing costs and assembly costs can be kept low.
[0042]
In addition, an outer tapered surface that increases in diameter toward the insertion end is formed on the outer peripheral surface of the split ring body, and an inner tapered surface that is in close contact with the outer tapered surface on the inner peripheral surface of the covering ring body Therefore, when the output force is applied to the fluid pipe, the locking surface engages with the engaging member, and the split ring body is pushed into the annular groove by the wedge action and strongly engages and prevents it from coming out. Will improve.
[0044]
[Brief description of the drawings]
FIG. 1 is a partially cutaway front view showing a first embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view showing a lock ring, similarly.
3A is a front view showing a lock ring attached to an insertion slot, and FIG. 3B is a side view thereof.
FIG. 4 is an enlarged cross-sectional view showing a lock ring according to a second embodiment of the present invention.
5A is a front view showing a lock ring attached to the insertion slot, and FIG. 5B is a side view thereof.
FIG. 6 is an enlarged sectional view showing a lock ring according to a third embodiment of the present invention.
7A is a front view showing a lock ring attached to the insertion portion, and FIG. 7B is a side view thereof.
FIG. 8 is a cross-sectional view of a conventional lock ring.
[Explanation of symbols]
1 Spigot pipe (fluid pipe)
1a Insertion Portion 1b Lock Ring 1c Annular Groove 2 Split Ring Body 2a Outer Tapered Surface 2b Concave Groove
3 Cover ring body 3a Inner taper surface 3b Engagement rod 3c Engagement surface 3d Locking piece 4 Ball body 4a Packing receiving groove 5 Locking member 6 Cover body 6a Flange portion 6b Receiving portion 7 Packing 8 Ball presser 9 Packing

Claims (1)

A fluid pipe in which the lock ring provided in a convex shape on the outer peripheral surface of the insertion portion of the fluid pipe inserted through the locking member engages with the locking member to prevent the fluid pipe from being pulled out. In the anti-extraction device,
The lock ring is composed of a split ring body having at least one split portion that fits in an annular groove formed on the outer peripheral surface of the insertion portion, and a covering ring body covering the outer peripheral surface of the split ring body,
The outer peripheral surface of the split ring body is formed with an outer tapered surface that expands toward the insertion end, and the inner peripheral surface of the covering ring body is in close contact with the outer tapered surface of the split ring body. A tapered surface is formed,
A plurality of engagement rods are formed integrally on the end side of the insertion portion of the covering ring body, and a locking piece directed in the inner diameter direction is formed at the tip of the engagement rod. , has become a engagement surface rear side in the insertion direction of the cover ring body is brought into contact with the locking member,
The fluid pipe is characterized in that when the covering ring body is pulled toward the insertion port side of the fluid pipe, the engagement rod is bent along the outer tapered surface, and the locking piece gets over the split ring body and engages. Extraction prevention device.

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